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Inventory (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventory

Inventory consisted of the following at March 31, 2018 and December 31, 2017 (in thousands):

 

March 31,

 

 

December 31,

 

  

2018

 

 

2017

 

Finished goods

$

2,269

 

 

$

2,270

 

Work-in-process

 

1,175

 

 

 

529

 

Raw materials and supplies

 

68,625

 

 

 

66,368

 

Inventory

$

72,069

 

 

$

69,167